题目

点（，）关于轴对称的点的坐标为___________________．   答案：（，）解析:略  —Did you see the traffic accident yesterday? —Yes, I saw it________when I ________ past the school gate. A. to happen; walked　　　　　　　　　　　　 B. happen; was walking C. had happened; was walking　　　　　　 D. was happened; walked